I'm assuming you're referring to 2nd hand.
Personally I do the following....
1. Snow Foam (be warned you'll need lance and pressure washer)
2. Wash with Shampoo and MF Sponge (2 bucket method)
3. Dry
4. Clay
5. re-wash
6. Hand Polish using light cutting pad (one off/annual)
7. Glaze using this for light coloured cars or this for dark using suitable applicator pad
8. Wax with foam applicator
As for your alloys
1. Bilberry wheel cleaner
2. Clay/tar remover to get rid of stubborn brake dust
3. Metal polish
4. Sealant
I do this every 4 months or so and in between just foam-wash-dry-clean alloys
I've linked to products I use on my car, but other people will have preferences for different products. It's about experimenting and finding what works best for you.
Any questions....
Why would you re-wash it after claying

Personally I think that unless you are machine polishing, claying also isn't that essential. I used the AIO Autoglym SRP, while half my bonnet was clayed and half wasn't, both halves showed the same result, the swirls practically disappeared after 3 layers of hand applying SRP with meg's foam app pads and buffing off with MF cloth, clayed or not clayed.
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